Bolleb mill



June 5, 1923.-

F. E. MARCY ROLLER MILL Origin l Filed Jan. 25,

a ya

Reissued June 5, 1923.

UNITED STATES- PATENT OFF ICE.

rm]: E. mcv, or LOS nnennns, CALIFORNIA.-

' ROLLER MILL.

Original 1T0.- 1,861,601, dated December 7, 1920, Serial No. 273,097,filed Ianuary 25, 1919. Renewed October 18, 1920, Serial No. 416,773.Application for reissue filed November 29, 1922. Serial No.

To all whom it may concern:

Be it known that I, FRANK E. MARCY, a citizen of the United States,residing at Los Angeles, in the county of Los Angeles and 5 State ofCalifornia, have invented certain.

new and useful Improvements in Roller Mills, of which the following is aspecification, reference being had to the accompanying drawings, forminga part hereof, the same being a division of an application filed on the16th day of November, 1922, Serial No. 601,240, for reissue of my PatentNo.

1,361,601, dated December 7, 1920. The present invention is directed toimprovements in roller (or rod) mills which, as well understood in theart, belong to that class of reducing or disintegrating apparatuswherein the material is reduced by means of freely movingreducing bodiesin 20 the form of rods or rollers extended longitudinally substantiallythe length of the reducing compartment of the mill, the latter being inthe form of a suitable tumbling barrel, drum, or equivalent tubularcontainer or treatment vessel rotated about a fixed axis, the oppositeextremities of the barrel being provided respectively with intake orfeed, and discharge openings for the material. The present improvementis concerned with that type of mill in which the discharge end is leftopen and unobstructed (in contradistinction to the trunnion overflowtype ofmill) for the passage of the material therethrough and for thepurpose of aflording access to'the interior of the mill at all times,and permitting inspection of its contents at any stage of the reducingoperation. A mill of the open end type here referred to is provided witha flange or dia- 40 phragm at the point of discharge, said flangeserving to build up or raise the pulp line in the mill and therebypermitting the charge of material to be subjected to the reducing actionof the rods (or their equivalent) for a somewhat longer period of timethan would be the case were the flange dispensed with and the pulp lineallowed to drop. It is desirable in a mill of the char- I acter referredto, to provide means for preventing the reducing bodies from beingprojected out of the mill through the open dischar e end, or through theavailable opening defined by the inner edge of the flange aforesaid; andin the present embodiment while the free and uninterrupted discharge ofthe material from the mill will be permitted, the door serves as aneffective barrier against the projection or precipitation of thereducing bodies from the mill. This guard partakes of the nature of ahinged door which may be manipulated at will so as to uncover theopening defined by the inner edge of the flange for purposes ofinspection of the mill contents or for the purpose of gaining access tothe reducing compartment of the mill at any stage of thereducingoperation.

The present improvement is characterized mainly by simplicity ofconstruction and effectiveness in operation, and advantages of theimprovement will be clearly apparent from the following detaileddescription in connection with the accompanying drawings in which Fig. 1represents a side elevation of a mill with parts broken away, showing myinvention .embodied therein.

Fig. 2 is a vertical middle longitudinal section of the barrel of themill.

Fig. 3 is an end view of Fig. 2.

'Referring to the drawings:

D represents a (preferably) cylindrical container, drum, tumbling barrelor equivalent tubular member slightly pitched to the horizontal h, thereducing compartment 0' of the barrel containing the usual complement ofreducing bodies which in the present example are in the form oflongitudinally extended, loose, reducing rods or rollers 1 free totumble in the barrel as the latter rotates in the operation of the mill,only a portion of the entire complement of rods being hereinillustrated. The wall liner 2 is provided with inclined lifters 3 whichoperate to first lift the rods and then release them in such a way as tocause the rods to tumble or precipitateaway from the discharge openingof the mill, the rods being maintained permanently in the reducingcompartment C through the combined action of the pitch of the mill, thelifters 3, the flange 4 at the open discharge end of the mill, whichlikewise serves to raise or build up the pulp line, and the guard orrod-intercepting plate or door. In the present example the mill isprovided with a hollow feed or intake trunnion 5 equipped with aconventional scoop feeder 6, which scoops up the pulp from a. suitablelaunder 7, the material discharged fromthe mill being caught in alaunder 8 flange 4 is formed outward of its inner edge with an annularinterrupted discharge slot or passage-way u at such a point as-to raisethe lup line a: the desired degree, so that in t e rotation of thebarrel the reduced material will be discharge continuously through saidannular slot or passage-way. The pamge-wa or slot through the flangeextends circum erentially, and at the outer face of the flange thiscircumferential passage-way or slot is interrupted at intervals byintact portions of the flange or its equivalent, but this interruptionin no wise mterferes with the free discharge of the pulp fromthe mill.Preferably, the periphery of the door is made beveled or conical and theinner edge of the flange correspondingl formed to receive the door. Thepulp whlc builds u to the dotted line :2: indicated in ows through theslot in the flan an into the launder 8 as indicated by t e arrows.

As stated above the function of the door or guard 9 is to intercept anyrod tending and the like.

The operation is the same as in all mills of the general type or classto which the present mill belongs. The mill or barrel is given arotation in the direction indicated by the arrows in Fig. 1, the wallnearest the reader sweeping upward while the wall farthest away isdescending. The reducing rods 1 tumble freelyacross the reducingcompartment 0, but since in their tumbling movements they are constantlybeing directed away from the discharge 0 ning by the combined action ofthe itch o the mill, and the inclined lifters, it ollows that the rodswill remain normall out of contact with the door or guard 9, ut any rodwhich happens to strike the door 9 will of course neceaarily beintercepted and prevented from rods against the door is however notfrequent as the rods are in the main kept in the mill by the pitch ofthe mill, by the deflecting action of the lifters 3, and by the flange4. The pulp enters the reducing compartment C through the hollow feedtrunnion 5 at one extremity of the barrel and the finished productdischarges as previously indicated through the circumferentialpassage-way in the flange at the op ite extremity of the barrel and intothe lii linder 8.

The door or rod-intercepting member or plate 9 is, it will be observed,disposed across the rotation axis of the mill or barrel, said axispassing preferably through the center of'the door, and as the flange 4extends inwardly from the wall of the barrel towards the rotation axis,the door closes across the plane of disposition of the flan e.

In the construction descri d, the discharge slot for the materialconforms to the position desired for the pulp line, which, of course maybe raised or lowered according to circumstances, and accordin toconditions to be met with in practice. T e present invention of courseis not to be restricted in its application to mills with a pulp line ofthe particular height indicated herein, but Is to be understood asapplicable to mills havingany range of pulp line positions from thelowest to the highest which may be tolerated in practice.

Having described my invention, what I claim is:

1. In a mill of the character described, a tumbling barrel having a feedend and a discharge end respectively at its opposite extremities andadapted to contain longitudi nally extending loose freely movablereducing bodies, an inwardly projectin flange at the discharge end ofthe ba and a guard closing across the plane of disposition of the flangeand movable at will without disturbing the other parts of the mill topermit access to the interior of the barrel, said flange being providedwith a passageway outward of its inner edge for eifecting the directdischarge of material from the barrel.

2. In a mill of the character described, a tumbling barrel having a feedend and a dischar end and adapted to contain lon tudjnal y extendingloose freely movalfi e reducing bodies, and inwardly projecti l8 flangeat the discharge end of the barrel, an

a guard closing across the plane of dispos' ition of the flan androtatable with the barrel and move. le at will to rmit access to theinterior of the barrel, sair flange being Bl tumbling barrel having afeed end and a 1'8.

dischar end, an inwardly pro'eetin flange at the discharge end of thebarrial, an a door closing across the lane of dis 'tion of the flan andmovab e at wi i ependently of the ange to rmit access to the interior ofthe barre said flange being provided with a assageway outward of itsinner edge for e eeting the direct discharge of material from thebarrel, said passageway being interruirted at the outer side of theflange.

4. n a mill of the character described, a tumbling barrel hav' a feedend and a discharge end, an an ar inwardly pro'ectn flange at thedischarge end of said rref defining an openin at said end and a doorfittin within sai opening, said flange being rovided'with a assage-wayoutward of sai o ning for e ecting'the direct discharge 0 material fromthe barrel.

5. In a mill of the character described, a gambling laarrel ha'vinlgdil.feed end and A; disar en an inwa ro'ectin ange at ff: disc f t eli mgand a harge end 0 hinged door closing across the plane of disposition ofthe flange, said flange being provided with a p way outward of its inneredge for efiectin of matenal from the rrel.

6. In a mill of the character described, a tumbling barrel havin a feedend and a discharge end, an inwar 1y projecting flange at the 'schargeend of the barrel, and a bin door closing across the plane ofdisposition of the flange and rotatable with the barrel, said flangebeing provided with a p'assa eway outward ofjits inner edge foreffecting the direct discharge of material f rom the barrel.

7. In a mill of the character described, a tiliimbling (lien-e1 havinl afeed end arid a disc an en an inwar yproject' ange at the 'scharge endof the barrel, a lid a hinged door closing across the glane ofdisposition of the flange and rotate le with the barrel, said flangebeing provided with a circumferential passa -wa outward of its inneredge for eflecting t e direct discharge of material from the barrelf iIn testimony whereof, I have aflixed my signature hereto.

FRL NK E. MARCY.

the direct discharge

